The Schneider Electric A9F04310 is a 10 A, 3-pole miniature circuit breaker from the Acti9 iC60 series, with a C curve (magnetic trip at 8 x In ±20 %). Breaking capacity is the headline number here: 36 kA Icu at 12…133 V AC, 20 kA at 220…240 V, 10 kA at 380…415 V, and 6 kA at 440 V AC per EN/IEC 60947-2. It also carries a 10 kA Icn rating at 400 V per EN/IEC 60898-1.
Snaps onto a DIN rail (mounting support: DIN rail). The 3-pole body takes 6 x 9 mm pitches — 54 mm wide, 91 mm tall, 78.5 mm deep. Terminals accept 1…25 mm² rigid or 1…16 mm² flexible wire; strip 14 mm and torque to 2 N·m. IP20 rated, so it's for inside a panel or enclosure, not for washdown areas.
Dual-certified to EN/IEC 60898-1 (the household / commercial MCB standard) and EN/IEC 60947-2 (the industrial breaker standard). That means it passes both the 10 kA Icn test at 400 V for general use and the higher Icu tests for industrial coordination. Pollution degree 3, overvoltage category IV — suited for harsh electrical environments. Isolation-rated per both standards, so it can be used as a disconnecting means under load.